Air-brake mechanism



May 26, 1925. c. s. JAKsoN AIR .BRAKE MECHANIISM Filed Feb. 11, '1924 JMW @l Patented May 26, 1925.

UNITED STATES PATENT OFFICE.

CHARLES SUM'NEE JACKSON, 0E SHAWINIGAN EALLS, QUEBEC, CANADA, ASsiCNoE 0E CNE-HALE To FREDERICK STEWART BECWN, or MONTREAL, QUEBEC, CANADA.

AIR-BRAKE MECHANISLI.

Application filed February 11, 1924. Serial Nfo. 692,010.`

ToV all 10710111, t may conce/fa.'

lle it known that I, CHARLES SUMNER JACKSON, a citizen of the United States of America, and residing at the town of Shawinigan Falls, in the Province oi' Quebec,

in the Dominion of Canada7 have invented a new and useful Air-Brake Mechanism', of Vwhich the following is the specification.

The invention relates to an air brake mechanism as described in the present speciylication and illustrated in the accompanying drawings that form part of the same.

The invention consists essentially of the novel features -ot construction pointed out broadly and specifically in the claims for nove ty following a description containing' an explanation in detail of'an acceptable form of the invention.

The objects of the invention are to simplify the application of the brakes of a car or other vehicle in air brake systems; to econo.- mize in regard to the volume of compressed air used up in the many operations to effect an instantaneous application and a quick release of the brakes; to centralize the exA haust ot air incidental to the application and generally to provide an eliticient,vdur able, and serviceable air brake mechanism.

ln the drawings, Figure 1 is a. side elevation of the air operating valve, showing the connection to the brake shoes.

Figure 2 is an enlarged longitudinal sectional view of the valve cylinder and connections.

Figure 3 is a plan view of the mechanism showing the connections to the brake levers.

Figure 4 is a sectional detail of reservoir control valve.

Like numerals of reference indicate corresponding parts in the various igures.

Referring to the drawings, the valve cyl inder 1 is formed with al longitudinal pin slot 2 centrally arranged between the heads and 4, the latter having air ports 5 and in which the air pipes 7 and 8 are secured'.

The piston 9 operates in the cylinder 1 and'is of Sufficient length to keep the pin slot 2 continuously covered notwithstanding the :forward and return stroke of said pis ton, the latter having the piston rings 10 and 11 in corresponding grooves and always beyond the ends of the pin slot 2 no matter what the position of the piston may be'.

The pin 12 is secured to the piston 9 through tie slot 2 and at its upper end forms a pivot bearing for the inner ends ot they rocker arms 13 and 14.

The rocker arms 13 and-14 are pivotally1 mounted on the' bearings 15 and 16 rigid with the car body 17 and the outer yends ol' the said. rocker arms are pivotally secured to the reach rods 18 and 19 respectively.

The reach rods at their far ends are pivotn ally secured to the brake levers 2O and 21 and the latter are operatively connected to the brake beams and shoes 22 and 23 so that any movement of said reach rods forward or return at once affects the brake levers for the application or releaseof the brakes.

The cylinder 1 is connected through the pipes 7 and cut o'fl' valve 24 to the com'- pressed air reservoir 25 and through the pipe S to the operating line of piping formed oi the longitudinal section 26 and the end sections 27 and 28, the latter being connected to the opposite end of the reservoir 25 said piping 26 between the end section 27 and end section 28 having an emergency valve 30 operable from the car by the rod 81. The longitudinal section 26 is connected to the train line air supply piping 82 through the cut off valve 33, said train line 32 leading from the main reservoir 34, which in steam railways is situated in the locomotive and in the connection 35 between thisy reservoir 34 and the train line, the three way valve 36 is located.

The spring held valve 37 is secured the outer end port of the reservoir 25 and the spring 38 is introduced in the outer end of the cylinder 1 between the head 4 and piston 9 to normally maintain the latter towards the headA 3. The spring valve 37 is formed of a casing having the cylindrical chamber 39 and the inlet 40 and outlet 41, the latter leading to the inlet of the rescrvoir t one side of said casing the by-pass 42extends for thel 'fullf length of the cylindrical chamber 39 and isv separated there l k'from by the wally-43 having the ports `44 and 45 at the inlet and outlet end respectively.

A The valve 46 operates in the cylindrical chamber 39 over the port 44 and is normally held by the spring 47y to close said port 44 and is opened by Ithe pressure of air from the train line during the operation `of lilling the reservoir.

ln the-operation of the invention the valve 36 is in the Afirst vplace turned to permit. the flow of'compressed vair from vthe main reservoir' to the train line of piping forming the principal channel for the passage `ot air to voperate the air brake-systems installed inthe several cars of a train. Each car equipment ol air brake mechanism is con- Y slantly connected with the train line piping andV While cutofsare provided they `are only used during repairs or replacements,

` therefore-the compressed air will HOW into and through the piping of each car equipment and charge the reservoir 25, besides Vflowing into the outer 4end of the cylinder l, and thereby assisting the spring in maintaining the piston rnormally adjacent to the head'.

in this condition the mechanism is hala'nced andthelnakes hang loose, ybut the monien'tfan exhaust of air occurs through the three Way valve `36, the pressure is re-` ll'xeved from 4the -tr'ain line and correspondingly-relieved inthe circuit piping -oi' Veach the spring fforces Vthe Vair back to the res- `ervoir Q5, where any loss is immediately made-good from the circuit pipes.

Tt will "be seen lthat the loss vof air in this system is "negligible, for Where there bareseveral equipments in use the relief may beaccomplished ata main supply tank and faect `every 'equipment equally.

Vvt-must be lparticularly emphasized that owing 'to the'balanced `pressure the brake .shoes 4are steadily and firmly applied and Vnot V`hammered' to the Wheel, consequentlyv 4both in vtheV emergency and 4service applica- 'tion the shoes Will gradually yet quickly come to engagement with the Wheels, there- Vl'ryYeliminatingthe troubles usually due to 'rough application and the Vresulting Yfiat `Wheels. caused bythe hissing of the escaping vair under thev car is a great com-fort toA pas- VFurtherv the absence of the noiseV sengers as Well as economy as mentioned ATheskidding lincident tofthe dat wheels is thus avoided -and'many troubles are abrsent such as leaky `cylinders Sand compli-r fcated connecting yrods and mechanism.

Vhat I claim is l. An ai-r brake `mechanism comprising a cylinder having' a longitudinal `pin slot in the Wall thereof, a piston reciprocating in 4said cylinder and constantly closing said slot and a `in projecting outwardly through `saidslot `rom said piston, an accompanying air reservoir constantly connected to and communicating with said cylinder, a pipe line circuit including said cylinder and reservoir, and connected to a source of compressed air, a reservoir control valve, a main control valve and levers and reach rods ccnnecting said-pin with th'e'brale lever's.

2. An air brake mechanism comprisinga cylinder having :air ponts-through the heads thereof and a pin` slot through the wall and yadapted -to be secured to the car bodyfa piston `reciprocaiting in said1-cylinder :and constantly closingy saidslot and va pin projecting outwardly through said vslot from said piston, an accompanying air reservoir tconstantly connected to -afnd :communicating with said cylinder, va pipe linefcircuit including said cyl-finder fand reservoir, and connected "to a :source of compressed air, :a reser- Voir control valve, a malin controlyalverand levers and reach yrods connecting said pin with ithebwke levers.

3. An air brake mechanism comprising a Acylinder"having end ports in the heads :and pipe connections from said ports and" a centrai longitudinalslct ci approximately A:one

quarterthe llengthof the complete cylinder, la piston reciprocating in said cylinder and having a pin projection extending `through 4said slot, Ianfacccmpanying air reservoir constantly @connected to :and communicating with-said cylindena pipe line y'circuit including said cylinder kand reservoir, and "connected4 to afsource vof :compressed air, fa reservoir :control valve, 'a main `'ccnatn'ol valve, I:and levers and reach :rods connecting said pin with the VIma-Icelevers. y

Y4. .An air brake mechanism comprising .a cylinder havin a longitudinal pin Islot in the wall thereo, a piston constantly :closing vsaid slot during recipnccation fin said cylinder-and having piston rings in corresponding grooves always beyond the ends of said slot, -a spring :introduced in said cylindeihetween said piston Jandlthe outer cylinder head,a pin `projecting outwardly ,through lsaid slot, ianraccompany-inig air reservoir constantly .connected to .and communicatin -Withsaid cylinder, ia :pipe :line circuit inclu ing said cylinder-and reservoir, fand connected toasourc'e of compressed air, a j reservoir-control valve, a maincxtrol valve, andv levers and "reach rods connecting said pin with the brake-levers. l

5. .An air brake mechanism comprising -a cylinder having a longitudinal xpin ,slot in the wall thereof, "a piston :reciprocating in said 4cylimderand constantly closing saidr'slot land a pin projectingoutwardly through said slot `from said piston, an `accompanying airl reservoir constantly connected to and communicating with said cylinder, a pipe line circuit including said cylinder and reservoir and connected to a source of compressed air, a reservoir control valve, a main control valve, and levers pivotally mounted on said pins and on pivots from the car body and connected by reach rods to the brake levers.

G. An air brake mechanism comprising a cylinder having a longitudinal pin slot in the wall thereof, a piston reciprocating in .said cylinder and constantly closing said slot and a pin projecting outwardly through said slot from said piston, an accompanying air reservoir constantly connected to and communicating with said cylinder, a pipe line circuit including said cylinder and reservoir and connected to a source of compressed air, a reservoir control valve, a main control valve, and levers at one end pivotally mounted on said pin and extending outwardly therefrom in opposite directions, an intermediate pivotal mounting for each of said levers and reach rods extending in opposite directions from said levers respectively to brake mechanisms.

7. In an air brake mechanism, a cylinder containing an operating piston having a connection pin projecting therefrom through a slot in said cylinder, a lever in the form of a rocker arm pivotally secured to said pin, a reach rod t0 a brake lever, a circuit of piping, and a source of supply of compressed air.

8. In devices operated by expansible fluid, a cylinder and luid tank suitably connected, a. piston operating in said cylinder and having a connection pin therefrom extending outwardly through an elongated slot in the wall of said cylinder, valves controlling the flow of said fluid, and connections pivotally secured and extending from said pin.

Signed at Montreal, this 28th day of January 1924.

CHARLES SUMNER JACKSON. 

